Fatigue Response Analysis of Steel Pipe Piles with Super Length to Diameter Ratio Under Adverse Sea Conditions

As an important component of seaport structures, steel pipe piles are subjected to cyclic loads over long periods of time in marine environments, especially when steel pipe piles are subjected to large bending moments, where the weld position is susceptible to fatigue damage. Based on an engineering example, a load-pile-soil triaxial fatigue analysis model was established to study the fatigue response rule of steel pipe piles under wave load, and the following conclusions were obtained: Regardless of whether the factor of weld is considered, the wave load with the wave height below 3.5 m will not cause fatigue damage to the steel pipe pile with the pile diameter of 1.2 m and wall thickness of 20 mm. The increased wave load will reinforce the effect of the weld on the steel pipe piles, resulting in a rapid reduction in the fatigue life of the steel pipe piles and a larger range of fatigue damage.